diff --git a/src/renderer/components/sidebar/GlobalTaskList.tsx b/src/renderer/components/sidebar/GlobalTaskList.tsx
index 37fdc2cb..f5868894 100644
--- a/src/renderer/components/sidebar/GlobalTaskList.tsx
+++ b/src/renderer/components/sidebar/GlobalTaskList.tsx
@@ -401,6 +401,15 @@ const TaskRows = memo(function TaskRows({
   );
 });
 
+function areTaskReferencesEqual(prev: readonly GlobalTask[], next: readonly GlobalTask[]): boolean {
+  if (prev === next) return true;
+  if (prev.length !== next.length) return false;
+  for (let i = 0; i < prev.length; i += 1) {
+    if (prev[i] !== next[i]) return false;
+  }
+  return true;
+}
+
 interface ProjectTaskGroupProps {
   group: ProjectTaskGroupData;
   isCollapsed: boolean;
@@ -427,131 +436,159 @@ interface ProjectTaskGroupProps {
   getOwnerColorName: TaskOwnerColorResolver;
 }
 
-const ProjectTaskGroup = memo(function ProjectTaskGroup({
-  group,
-  isCollapsed,
-  visibleCount,
-  noProjectGroupColor,
-  showMoreLabel,
-  showLessLabel,
-  isPinned,
-  isArchived,
-  isNewTask,
-  isTeamOffline,
-  renamingKey,
-  formatTeamHeader,
-  onToggleGroup,
-  onVisibleCountChange,
-  onTogglePin,
-  onToggleArchive,
-  onMarkUnread,
-  onRename,
-  onDelete,
-  onRenameComplete,
-  onRenameCancel,
-  getDisplaySubject,
-  getOwnerColorName,
-}: ProjectTaskGroupProps): React.JSX.Element | null {
-  if (group.tasks.length === 0) return null;
+const ProjectTaskGroup = memo(
+  function ProjectTaskGroup({
+    group,
+    isCollapsed,
+    visibleCount,
+    noProjectGroupColor,
+    showMoreLabel,
+    showLessLabel,
+    isPinned,
+    isArchived,
+    isNewTask,
+    isTeamOffline,
+    renamingKey,
+    formatTeamHeader,
+    onToggleGroup,
+    onVisibleCountChange,
+    onTogglePin,
+    onToggleArchive,
+    onMarkUnread,
+    onRename,
+    onDelete,
+    onRenameComplete,
+    onRenameCancel,
+    getDisplaySubject,
+    getOwnerColorName,
+  }: ProjectTaskGroupProps): React.JSX.Element | null {
+    if (group.tasks.length === 0) return null;
 
-  const isNoProjectGroup = group.projectKey === NO_PROJECT_KEY;
-  const groupColor = isNoProjectGroup ? noProjectGroupColor : projectColor(group.projectLabel);
-  const showMoreVisible = canProjectGroupShowMore(visibleCount, group.tasks.length);
-  const showLessVisible = canProjectGroupShowLess(visibleCount, group.tasks.length);
+    const isNoProjectGroup = group.projectKey === NO_PROJECT_KEY;
+    const groupColor = isNoProjectGroup ? noProjectGroupColor : projectColor(group.projectLabel);
+    const showMoreVisible = canProjectGroupShowMore(visibleCount, group.tasks.length);
+    const showLessVisible = canProjectGroupShowLess(visibleCount, group.tasks.length);
 
-  return (
-    <div>
-      <button
-        type="button"
-        onClick={() => onToggleGroup(group.projectKey)}
-        className="hover:bg-surface-raised/40 sticky top-0 z-10 flex w-full cursor-pointer items-center gap-1.5 p-2 transition-colors"
-        style={{
-          backgroundColor: 'var(--color-surface-sidebar)',
-          backgroundImage: isNoProjectGroup
-            ? undefined
-            : `linear-gradient(90deg, ${groupColor.glow} 0%, transparent 80%)`,
-          boxShadow: `inset 2px 0 0 ${groupColor.border}, inset 0 -1px 0 var(--color-border)`,
-        }}
-      >
-        {isCollapsed ? (
-          <ChevronRight className="size-3 shrink-0 text-text-muted" />
-        ) : (
-          <ChevronDown className="size-3 shrink-0 text-text-muted" />
-        )}
-        <Folder
-          className="size-3.5 shrink-0"
-          style={{ color: groupColor.icon }}
-          aria-hidden="true"
-        />
-        <span
-          className="truncate text-[11px] font-bold leading-none"
-          style={{ color: groupColor.icon }}
+    return (
+      <div>
+        <button
+          type="button"
+          onClick={() => onToggleGroup(group.projectKey)}
+          className="hover:bg-surface-raised/40 sticky top-0 z-10 flex w-full cursor-pointer items-center gap-1.5 p-2 transition-colors"
+          style={{
+            backgroundColor: 'var(--color-surface-sidebar)',
+            backgroundImage: isNoProjectGroup
+              ? undefined
+              : `linear-gradient(90deg, ${groupColor.glow} 0%, transparent 80%)`,
+            boxShadow: `inset 2px 0 0 ${groupColor.border}, inset 0 -1px 0 var(--color-border)`,
+          }}
         >
-          {group.projectLabel}
-        </span>
-        <span className="ml-auto shrink-0 text-[10px] font-normal text-text-muted">
-          {group.tasks.length}
-        </span>
-      </button>
-      {!isCollapsed && (
-        <TaskRows
-          tasks={group.tasks}
-          visibleCount={visibleCount}
-          isPinned={isPinned}
-          isArchived={isArchived}
-          isNewTask={isNewTask}
-          isTeamOffline={isTeamOffline}
-          hideTeamName
-          hideProjectName
-          showTeamHeader
-          formatTeamHeader={formatTeamHeader}
-          renamingKey={renamingKey}
-          onTogglePin={onTogglePin}
-          onToggleArchive={onToggleArchive}
-          onMarkUnread={onMarkUnread}
-          onRename={onRename}
-          onDelete={onDelete}
-          onRenameComplete={onRenameComplete}
-          onRenameCancel={onRenameCancel}
-          getDisplaySubject={getDisplaySubject}
-          getOwnerColorName={getOwnerColorName}
-        />
-      )}
-      {!isCollapsed && (showMoreVisible || showLessVisible) && (
-        <div className="flex items-center gap-2 px-3 pb-2 pt-1">
-          {showMoreVisible && (
-            <button
-              type="button"
-              className="text-[11px] font-medium text-text-muted transition-colors hover:text-text"
-              onClick={() =>
-                onVisibleCountChange(
-                  group.projectKey,
-                  getNextProjectGroupVisibleCount(visibleCount, group.tasks.length)
-                )
-              }
-            >
-              {showMoreLabel}
-            </button>
+          {isCollapsed ? (
+            <ChevronRight className="size-3 shrink-0 text-text-muted" />
+          ) : (
+            <ChevronDown className="size-3 shrink-0 text-text-muted" />
           )}
-          {showLessVisible && (
-            <button
-              type="button"
-              className="text-[11px] font-medium text-text-muted transition-colors hover:text-text"
-              onClick={() =>
-                onVisibleCountChange(
-                  group.projectKey,
-                  getPreviousProjectGroupVisibleCount(visibleCount, group.tasks.length)
-                )
-              }
-            >
-              {showLessLabel}
-            </button>
-          )}
-        </div>
-      )}
-    </div>
-  );
-});
+          <Folder
+            className="size-3.5 shrink-0"
+            style={{ color: groupColor.icon }}
+            aria-hidden="true"
+          />
+          <span
+            className="truncate text-[11px] font-bold leading-none"
+            style={{ color: groupColor.icon }}
+          >
+            {group.projectLabel}
+          </span>
+          <span className="ml-auto shrink-0 text-[10px] font-normal text-text-muted">
+            {group.tasks.length}
+          </span>
+        </button>
+        {!isCollapsed && (
+          <TaskRows
+            tasks={group.tasks}
+            visibleCount={visibleCount}
+            isPinned={isPinned}
+            isArchived={isArchived}
+            isNewTask={isNewTask}
+            isTeamOffline={isTeamOffline}
+            hideTeamName
+            hideProjectName
+            showTeamHeader
+            formatTeamHeader={formatTeamHeader}
+            renamingKey={renamingKey}
+            onTogglePin={onTogglePin}
+            onToggleArchive={onToggleArchive}
+            onMarkUnread={onMarkUnread}
+            onRename={onRename}
+            onDelete={onDelete}
+            onRenameComplete={onRenameComplete}
+            onRenameCancel={onRenameCancel}
+            getDisplaySubject={getDisplaySubject}
+            getOwnerColorName={getOwnerColorName}
+          />
+        )}
+        {!isCollapsed && (showMoreVisible || showLessVisible) && (
+          <div className="flex items-center gap-2 px-3 pb-2 pt-1">
+            {showMoreVisible && (
+              <button
+                type="button"
+                className="text-[11px] font-medium text-text-muted transition-colors hover:text-text"
+                onClick={() =>
+                  onVisibleCountChange(
+                    group.projectKey,
+                    getNextProjectGroupVisibleCount(visibleCount, group.tasks.length)
+                  )
+                }
+              >
+                {showMoreLabel}
+              </button>
+            )}
+            {showLessVisible && (
+              <button
+                type="button"
+                className="text-[11px] font-medium text-text-muted transition-colors hover:text-text"
+                onClick={() =>
+                  onVisibleCountChange(
+                    group.projectKey,
+                    getPreviousProjectGroupVisibleCount(visibleCount, group.tasks.length)
+                  )
+                }
+              >
+                {showLessLabel}
+              </button>
+            )}
+          </div>
+        )}
+      </div>
+    );
+  },
+  (prev, next) =>
+    prev.group.projectKey === next.group.projectKey &&
+    prev.group.projectLabel === next.group.projectLabel &&
+    areTaskReferencesEqual(prev.group.tasks, next.group.tasks) &&
+    prev.isCollapsed === next.isCollapsed &&
+    prev.visibleCount === next.visibleCount &&
+    prev.noProjectGroupColor === next.noProjectGroupColor &&
+    prev.showMoreLabel === next.showMoreLabel &&
+    prev.showLessLabel === next.showLessLabel &&
+    prev.isPinned === next.isPinned &&
+    prev.isArchived === next.isArchived &&
+    prev.isNewTask === next.isNewTask &&
+    prev.isTeamOffline === next.isTeamOffline &&
+    prev.renamingKey === next.renamingKey &&
+    prev.formatTeamHeader === next.formatTeamHeader &&
+    prev.onToggleGroup === next.onToggleGroup &&
+    prev.onVisibleCountChange === next.onVisibleCountChange &&
+    prev.onTogglePin === next.onTogglePin &&
+    prev.onToggleArchive === next.onToggleArchive &&
+    prev.onMarkUnread === next.onMarkUnread &&
+    prev.onRename === next.onRename &&
+    prev.onDelete === next.onDelete &&
+    prev.onRenameComplete === next.onRenameComplete &&
+    prev.onRenameCancel === next.onRenameCancel &&
+    prev.getDisplaySubject === next.getDisplaySubject &&
+    prev.getOwnerColorName === next.getOwnerColorName
+);
 
 export const GlobalTaskList = memo(function GlobalTaskList({
   hideHeader = false,